/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.tools.hiero.unicodefont;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.tools.hiero.unicodefont.effects.ColorEffect;
import com.badlogic.gdx.tools.hiero.unicodefont.effects.Effect;
/** Stores a number of glyphs on a single texture.
* @author Nathan Sweet */
public class GlyphPage {
private final UnicodeFont unicodeFont;
private final int pageWidth, pageHeight;
private final Texture texture;
private int pageX, pageY, rowHeight;
private boolean orderAscending;
private final List pageGlyphs = new ArrayList(32);
/** @param pageWidth The width of the backing texture.
* @param pageHeight The height of the backing texture. */
GlyphPage (UnicodeFont unicodeFont, int pageWidth, int pageHeight) {
this.unicodeFont = unicodeFont;
this.pageWidth = pageWidth;
this.pageHeight = pageHeight;
texture = new Texture(pageWidth, pageHeight, Format.RGBA8888);
}
/** Loads glyphs to the backing texture and sets the image on each loaded glyph. Loaded glyphs are removed from the list.
*
* If this page already has glyphs and maxGlyphsToLoad is -1, then this method will return 0 if all the new glyphs don't fit.
* This reduces texture binds when drawing since glyphs loaded at once are typically displayed together.
* @param glyphs The glyphs to load.
* @param maxGlyphsToLoad This is the maximum number of glyphs to load from the list. Set to -1 to attempt to load all the
* glyphs.
* @return The number of glyphs that were actually loaded. */
int loadGlyphs (List glyphs, int maxGlyphsToLoad) {
if (rowHeight != 0 && maxGlyphsToLoad == -1) {
// If this page has glyphs and we are not loading incrementally, return zero if any of the glyphs don't fit.
int testX = pageX;
int testY = pageY;
int testRowHeight = rowHeight;
for (Iterator iter = getIterator(glyphs); iter.hasNext();) {
Glyph glyph = (Glyph)iter.next();
int width = glyph.getWidth();
int height = glyph.getHeight();
if (testX + width >= pageWidth) {
testX = 0;
testY += testRowHeight;
testRowHeight = height;
} else if (height > testRowHeight) {
testRowHeight = height;
}
if (testY + testRowHeight >= pageWidth) return 0;
testX += width;
}
}
GL11.glColor4f(1, 1, 1, 1);
texture.bind();
int i = 0;
for (Iterator iter = getIterator(glyphs); iter.hasNext();) {
Glyph glyph = (Glyph)iter.next();
int width = Math.min(MAX_GLYPH_SIZE, glyph.getWidth());
int height = Math.min(MAX_GLYPH_SIZE, glyph.getHeight());
if (rowHeight == 0) {
// The first glyph always fits.
rowHeight = height;
} else {
// Wrap to the next line if needed, or break if no more fit.
if (pageX + width >= pageWidth) {
if (pageY + rowHeight + height >= pageHeight) break;
pageX = 0;
pageY += rowHeight;
rowHeight = height;
} else if (height > rowHeight) {
if (pageY + height >= pageHeight) break;
rowHeight = height;
}
}
renderGlyph(glyph, width, height);
pageGlyphs.add(glyph);
pageX += width;
iter.remove();
i++;
if (i == maxGlyphsToLoad) {
// If loading incrementally, flip orderAscending so it won't change, since we'll probably load the rest next time.
orderAscending = !orderAscending;
break;
}
}
// Every other batch of glyphs added to a page are sorted the opposite way to attempt to keep same size glyps together.
orderAscending = !orderAscending;
return i;
}
/** Loads a single glyph to the backing texture, if it fits. */
private void renderGlyph (Glyph glyph, int width, int height) {
// Draw the glyph to the scratch image using Java2D.
scratchGraphics.setComposite(AlphaComposite.Clear);
scratchGraphics.fillRect(0, 0, MAX_GLYPH_SIZE, MAX_GLYPH_SIZE);
scratchGraphics.setComposite(AlphaComposite.SrcOver);
if (unicodeFont.getNativeRendering()) {
for (Iterator iter = unicodeFont.getEffects().iterator(); iter.hasNext();) {
Effect effect = (Effect)iter.next();
if (effect instanceof ColorEffect) scratchGraphics.setColor(((ColorEffect)effect).getColor());
}
scratchGraphics.setColor(java.awt.Color.white);
scratchGraphics.setFont(unicodeFont.getFont());
scratchGraphics.drawString("" + (char)glyph.getCodePoint(), 0, unicodeFont.getAscent());
} else {
scratchGraphics.setColor(java.awt.Color.white);
for (Iterator iter = unicodeFont.getEffects().iterator(); iter.hasNext();)
((Effect)iter.next()).draw(scratchImage, scratchGraphics, unicodeFont, glyph);
glyph.setShape(null); // The shape will never be needed again.
}
width = Math.min(width, texture.getWidth());
height = Math.min(height, texture.getHeight());
WritableRaster raster = scratchImage.getRaster();
int[] row = new int[width];
for (int y = 0; y < height; y++) {
raster.getDataElements(0, y, width, 1, row);
scratchIntBuffer.put(row);
}
GL11.glTexSubImage2D(GL11.GL_TEXTURE_2D, 0, pageX, pageY, width, height, GL12.GL_BGRA, GL11.GL_UNSIGNED_BYTE,
scratchByteBuffer);
scratchIntBuffer.clear();
float u = pageX / (float)texture.getWidth();
float v = pageY / (float)texture.getHeight();
float u2 = (pageX + width) / (float)texture.getWidth();
float v2 = (pageY + height) / (float)texture.getHeight();
glyph.setTexture(texture, u, v, u2, v2);
}
/** Returns an iterator for the specified glyphs, sorted either ascending or descending. */
private Iterator getIterator (List glyphs) {
if (orderAscending) return glyphs.iterator();
final ListIterator iter = glyphs.listIterator(glyphs.size());
return new Iterator() {
public boolean hasNext () {
return iter.hasPrevious();
}
public Object next () {
return iter.previous();
}
public void remove () {
iter.remove();
}
};
}
/** Returns the glyphs stored on this page. */
public List getGlyphs () {
return pageGlyphs;
}
/** Returns the backing texture for this page. */
public Texture getTexture () {
return texture;
}
static public final int MAX_GLYPH_SIZE = 256;
static private ByteBuffer scratchByteBuffer = ByteBuffer.allocateDirect(MAX_GLYPH_SIZE * MAX_GLYPH_SIZE * 4);
static {
scratchByteBuffer.order(ByteOrder.LITTLE_ENDIAN);
}
static private IntBuffer scratchIntBuffer = scratchByteBuffer.asIntBuffer();
static private BufferedImage scratchImage = new BufferedImage(MAX_GLYPH_SIZE, MAX_GLYPH_SIZE, BufferedImage.TYPE_INT_ARGB);
static Graphics2D scratchGraphics = (Graphics2D)scratchImage.getGraphics();
static {
scratchGraphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
scratchGraphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
}
static public FontRenderContext renderContext = scratchGraphics.getFontRenderContext();
}